Center of Gravity

Discussion in 'Boat Design' started by Gene H, Mar 1, 2007.

  1. Gene H
    Joined: Mar 2007
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Minnesota

    Gene H Junior Member

    I have a 36 ft trawler with twin diesels. I'm changing transmissions and the new output shaft has a two inch drop from the old transmission ouput shaft centerline. This means I have to raise the engines two inches. Does anyone know if that is a minor adjustment or a major adjustment to the boats center of gravity. Obviously the longitudinal c/g goes up verticaly on the boat. Is two inches too much for a 36 ft long, 14 ft wide 10 ton boat? I believe the engine weight is 1200 to 1400 lbs per engine.
     
  2. Guillermo
    Joined: Mar 2005
    Posts: 3,644
    Likes: 189, Points: 63, Legacy Rep: 2247
    Location: Pontevedra, Spain

    Guillermo Ingeniero Naval

    Boat's COG will rise around 0.25"
    Cheers.
     
  3. tri - star
    Joined: Feb 2007
    Posts: 87
    Likes: 1, Points: 0, Legacy Rep: 3
    Location: Vancouver, B.C., Canada

    tri - star Junior Member

    You are right to be carefull.
    It WILL effect the C. of G. The wrong way. For stability....

    This is one of those Sq. Root multipliers.
    Consider: SUVs are only a few inches taller than a conventional
    car. - And they are MUCH more prone to rolling over - than a car is.
    Never mind the 4 wheel drive.

    Stongly suggest - that you seek out a reg. P. Eng. that does marine
    stuff. The cost will minimal. By the hour it's hardly any time a'tall.....
    Especially, considering the cost of re - floating your vessel !

    Cheers !
     
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